https://www.theguardian.com/technology/2020/apr/16/nhs-in-standoff-with-apple-and-google-over-coronavirus-tracing > Tech firms place limitations on how tracing apps may work in effort to protect users’ privacy > The NHS is in a standoff with Apple and Google after the two tech firms refused to support the UK’s plans to build an app that alerts users when they have been in contact with someone with coronavirus.